diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..9ef84d9
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,11 @@
+FullTreeDepthOne.png filter=lfs diff=lfs merge=lfs -text
+FullTreeDepthThree.png filter=lfs diff=lfs merge=lfs -text
+FullTreeDepthTwo.png filter=lfs diff=lfs merge=lfs -text
+FullTrees.png filter=lfs diff=lfs merge=lfs -text
+GrowTrees.png filter=lfs diff=lfs merge=lfs -text
+SecondDegreePolynomial.png filter=lfs diff=lfs merge=lfs -text
+ThirdDegreePolynomial.png filter=lfs diff=lfs merge=lfs -text
+SecondDegreePolynomial.pdf filter=lfs diff=lfs merge=lfs -text
+ThirdDegreePolynomial.pdf filter=lfs diff=lfs merge=lfs -text
+Trees.graffle filter=lfs diff=lfs merge=lfs -text
+Polynomials.numbers filter=lfs diff=lfs merge=lfs -text
diff --git a/.gitignore b/.gitignore
index 3dbffe6..a419a81 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 project/project
 project/target
 target
+*.txt
diff --git a/FullTreeDepthOne.png b/FullTreeDepthOne.png
new file mode 100644
index 0000000..0fff4be
--- /dev/null
+++ b/FullTreeDepthOne.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 20539
diff --git a/FullTreeDepthThree.png b/FullTreeDepthThree.png
new file mode 100644
index 0000000..d59a6b7
--- /dev/null
+++ b/FullTreeDepthThree.png
@@ -0,0 +1,3 @@
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diff --git a/FullTreeDepthTwo.png b/FullTreeDepthTwo.png
new file mode 100644
index 0000000..84a91a5
--- /dev/null
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+size 65784
diff --git a/FullTrees.png b/FullTrees.png
new file mode 100644
index 0000000..42d6436
--- /dev/null
+++ b/FullTrees.png
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diff --git a/GrowTrees.png b/GrowTrees.png
new file mode 100644
index 0000000..a235906
--- /dev/null
+++ b/GrowTrees.png
@@ -0,0 +1,3 @@
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+size 282254
diff --git a/PolynomialOfDegree3.md b/PolynomialOfDegree3.md
new file mode 100644
index 0000000..0f26fce
--- /dev/null
+++ b/PolynomialOfDegree3.md
@@ -0,0 +1,123 @@
+07:41:53.810 [run-main-5] DEBUG GP$ - run=43, minFitness=0.48753065, distinct=10000 crossovers.length=10000, replicas.length=1900
+07:41:56.277 [run-main-5] DEBUG Main$ - Fittest tree: Div(Sub(Sub(Sub(Div(Add(Div(Var('x),Con(-4.0)),Con(-3.0)),Sub(Con(2.0),Div(Con(-2.0),Con(2.0)))),Mul(Div(Var('x),Con(-4.0)),Mul(Var('x),Con(1.0)))),Mul(Div(Var('x),Con(-4.0)),Mul(Var('x),Con(1.0)))),Mul(Div(Var('x),Con(-3.0)),Div(Add(Con(-1.0),Con(-4.0)),Div(Con(-4.0),Con(-1.0))))),Div(Add(Div(Div(Con(0.0),Con(-3.0)),Sub(Sub(Mul(Div(Con(1.0),Con(3.0)),Con(-5.0)),Mul(Mul(Sub(Con(3.0),Con(-4.0)),Con(2.0)),Con(3.0))),Div(Sub(Sub(Div(Add(Sub(Div(Con(1.0),Con(3.0)),Div(Var('x),Con(-5.0))),Con(-3.0)),Mul(Con(0.0),Div(Con(-1.0),Sub(Div(Add(Con(0.0),Con(-3.0)),Div(Mul(Div(Con(4.0),Con(-5.0)),Div(Con(4.0),Mul(Div(Con(4.0),Con(-3.0)),Add(Var('x),Add(Mul(Con(0.0),Mul(Con(2.0),Con(0.0))),Add(Sub(Con(5.0),Con(1.0)),Div(Con(-3.0),Add(Con(2.0),Con(4.0))))))))),Sub(Add(Mul(Con(1.0),Con(2.0)),Con(0.0)),Div(Con(1.0),Con(2.0))))),Mul(Div(Div(Add(Var('x),Con(-3.0)),Div(Mul(Mul(Con(3.0),Con(-5.0)),Div(Div(Con(-5.0),Con(1.0)),Div(Con(-4.0),Con(-1.0)))),Con(2.0))),Div(Add(Con(3.0),Mul(Con(-1.0),Con(-3.0))),Mul(Div(Sub(Con(-3.0),Con(-1.0)),Div(Var('x),Con(-2.0))),Add(Div(Con(3.0),Con(4.0)),Mul(Con(2.0),Con(2.0)))))),Div(Var('x),Div(Con(-5.0),Con(-1.0)))))))),Mul(Div(Var('x),Con(-4.0)),Mul(Var('x),Con(1.0)))),Mul(Div(Mul(Con(1.0),Con(3.0)),Add(Con(-1.0),Con(-4.0))),Div(Sub(Con(-5.0),Con(4.0)),Div(Con(-4.0),Con(-1.0))))),Div(Div(Con(1.0),Con(3.0)),Add(Mul(Div(Con(1.0),Con(3.0)),Sub(Con(-4.0),Con(0.0))),Sub(Div(Mul(Con(1.0),Con(3.0)),Con(4.0)),Add(Con(-5.0),Con(-5.0)))))))),Add(Sub(Con(5.0),Con(1.0)),Mul(Con(0.0),Con(3.0)))),Add(Var('x),Sub(Add(Mul(Mul(Add(Mul(Mul(Sub(Add(Con(-2.0),Con(5.0)),Add(Con(-2.0),Con(4.0))),Add(Add(Con(-5.0),Con(4.0)),Sub(Var('x),Con(0.0)))),Mul(Sub(Add(Con(5.0),Con(4.0)),Sub(Con(0.0),Con(-1.0))),Div(Add(Div(Con(-4.0),Con(4.0)),Add(Con(5.0),Con(-2.0))),Sub(Con(-5.0),Add(Con(5.0),Con(-1.0)))))),Sub(Div(Con(2.0),Con(1.0)),Div(Con(3.0),Con(5.0)))),Mul(Con(1.0),Con(1.0))),Div(Con(0.0),Con(-1.0))),Sub(Var('x),Con(2.0))),Add(Con(-5.0),Con(-5.0))))))
+07:41:56.277 [run-main-5] DEBUG Main$ - expected    actual
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5  2.5
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5337815  2.5337815
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5602508  2.5602498
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5795932  2.5795932
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.592  2.592
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5976562  2.5976567
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5967498  2.5967498
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5894685  2.5894685
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5760002  2.5760002
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5565314  2.5565317
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5312505  2.5312502
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.5003438  2.5003438
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.4640007  2.4640002
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.4224072  2.422407
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.375751  2.3757508
+07:41:56.278 [run-main-5] DEBUG Main$ - 2.3242197  2.3242192
+07:41:56.279 [run-main-5] DEBUG Main$ - 2.2680006  2.2680008
+07:41:56.279 [run-main-5] DEBUG Main$ - 2.207282  2.2072823
+07:41:56.279 [run-main-5] DEBUG Main$ - 2.142251  2.1422508
+07:41:56.279 [run-main-5] DEBUG Main$ - 2.0730953  2.0730948
+07:41:56.279 [run-main-5] DEBUG Main$ - 2.0000014  2.0000014
+07:41:56.279 [run-main-5] DEBUG Main$ - 1.9231579  1.9231579
+07:41:56.279 [run-main-5] DEBUG Main$ - 1.8427515  1.8427517
+07:41:56.279 [run-main-5] DEBUG Main$ - 1.7589703  1.7589704
+07:41:56.279 [run-main-5] DEBUG Main$ - 1.6720021  1.6720021
+07:41:56.279 [run-main-5] DEBUG Main$ - 1.5820336  1.5820336
+07:41:56.279 [run-main-5] DEBUG Main$ - 1.4892523  1.4892523
+07:41:56.279 [run-main-5] DEBUG Main$ - 1.393846  1.393846
+07:41:56.279 [run-main-5] DEBUG Main$ - 1.2960026  1.2960026
+07:41:56.279 [run-main-5] DEBUG Main$ - 1.195909  1.1959091
+07:41:56.280 [run-main-5] DEBUG Main$ - 1.0937529  1.0937531
+07:41:56.280 [run-main-5] DEBUG Main$ - 0.9897218  0.9897217
+07:41:56.280 [run-main-5] DEBUG Main$ - 0.88400316  0.8840033
+07:41:56.280 [run-main-5] DEBUG Main$ - 0.7767849  0.7767848
+07:41:56.280 [run-main-5] DEBUG Main$ - 0.6682534  0.6682535
+07:41:56.280 [run-main-5] DEBUG Main$ - 0.5585973  0.5585973
+07:41:56.280 [run-main-5] DEBUG Main$ - 0.44800377  0.4480038
+07:41:56.280 [run-main-5] DEBUG Main$ - 0.33666015  0.3366602
+07:41:56.280 [run-main-5] DEBUG Main$ - 0.2247541  0.22475418
+07:41:56.280 [run-main-5] DEBUG Main$ - 0.11247301  0.11247296
+07:41:56.280 [run-main-5] DEBUG Main$ - 4.2915344E-6  4.2915317E-6
+07:41:56.280 [run-main-5] DEBUG Main$ - -0.11246443  -0.11246445
+07:41:56.280 [run-main-5] DEBUG Main$ - -0.22474575  -0.22474581
+07:41:56.288 [run-main-5] DEBUG Main$ - -0.33665204  -0.336652
+07:41:56.288 [run-main-5] DEBUG Main$ - -0.4479959  -0.44799584
+07:41:56.288 [run-main-5] DEBUG Main$ - -0.5585897  -0.5585895
+07:41:56.288 [run-main-5] DEBUG Main$ - -0.6682459  -0.66824603
+07:41:56.288 [run-main-5] DEBUG Main$ - -0.77677727  -0.77677745
+07:41:56.288 [run-main-5] DEBUG Main$ - -0.8839961  -0.88399625
+07:41:56.288 [run-main-5] DEBUG Main$ - -0.989715  -0.9897149
+07:41:56.288 [run-main-5] DEBUG Main$ - -1.0937463  -1.0937463
+07:41:56.289 [run-main-5] DEBUG Main$ - -1.1959026  -1.1959028
+07:41:56.289 [run-main-5] DEBUG Main$ - -1.2959964  -1.2959964
+07:41:56.289 [run-main-5] DEBUG Main$ - -1.3938403  -1.3938406
+07:41:56.289 [run-main-5] DEBUG Main$ - -1.4892467  -1.4892467
+07:41:56.289 [run-main-5] DEBUG Main$ - -1.5820282  -1.5820279
+07:41:56.289 [run-main-5] DEBUG Main$ - -1.671997  -1.671997
+07:41:56.289 [run-main-5] DEBUG Main$ - -1.7589657  -1.7589661
+07:41:56.289 [run-main-5] DEBUG Main$ - -1.8427472  -1.8427472
+07:41:56.289 [run-main-5] DEBUG Main$ - -1.9231535  -1.9231538
+07:41:56.289 [run-main-5] DEBUG Main$ - -1.9999974  -1.9999973
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.0730913  -2.073091
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.1422477  -2.1422477
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.207279  -2.2072794
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.267998  -2.2679977
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.3242168  -2.3242166
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.3757482  -2.3757484
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.4224048  -2.4224052
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.4639986  -2.4639988
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.5003426  -2.5003421
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.531249  -2.531249
+07:41:56.289 [run-main-5] DEBUG Main$ - -2.5565305  -2.5565305
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.5759995  -2.5759995
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.5894685  -2.5894687
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.5967498  -2.5967495
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.5976562  -2.597656
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.5920002  -2.592
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.5795941  -2.5795944
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.5602508  -2.560251
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.5337822  -2.5337827
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.5000012  -2.5000012
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.4587202  -2.4587202
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.4097517  -2.409752
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.3529084  -2.3529086
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.2880025  -2.2880023
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.2148466  -2.2148464
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.133253  -2.1332533
+07:41:56.290 [run-main-5] DEBUG Main$ - -2.043035  -2.043035
+07:41:56.290 [run-main-5] DEBUG Main$ - -1.9440038  -1.9440037
+07:41:56.290 [run-main-5] DEBUG Main$ - -1.8359733  -1.8359731
+07:41:56.290 [run-main-5] DEBUG Main$ - -1.7187548  -1.718755
+07:41:56.291 [run-main-5] DEBUG Main$ - -1.5921619  -1.5921619
+07:41:56.291 [run-main-5] DEBUG Main$ - -1.456006  -1.4560057
+07:41:56.291 [run-main-5] DEBUG Main$ - -1.3101003  -1.3101001
+07:41:56.291 [run-main-5] DEBUG Main$ - -1.154257  -1.1542573
+07:41:56.291 [run-main-5] DEBUG Main$ - -0.9882891  -0.98828894
+07:41:56.291 [run-main-5] DEBUG Main$ - -0.8120084  -0.8120082
+07:41:56.291 [run-main-5] DEBUG Main$ - -0.6252277  -0.6252277
+07:41:56.291 [run-main-5] DEBUG Main$ - -0.4277599  -0.42775998
+07:41:56.291 [run-main-5] DEBUG Main$ - -0.21941662  -0.21941668
+07:41:56.291 [run-main-5] DEBUG Main$ - -1.1444092E-5  -1.10864585E-5
+07:41:56.291 [run-main-5] DEBUG Main$ - 0.2306447  0.23064466
+07:41:56.291 [run-main-5] DEBUG Main$ - 0.4727378  0.47273734
+07:41:56.291 [run-main-5] DEBUG Main$ - 0.7264557  0.7264556
+07:41:56.291 [run-main-5] DEBUG Main$ - 0.99198604  0.99198633
+07:41:56.291 [run-main-5] DEBUG Main$ - 1.269516  1.2695163
+07:41:56.291 [run-main-5] DEBUG Main$ - 1.5592341  1.559234
+07:41:56.291 [run-main-5] DEBUG Main$ - 1.8613272  1.8613272
+07:41:56.291 [run-main-5] DEBUG Main$ - 2.1759825  2.1759827
+07:41:56.291 [run-main-5] DEBUG Main$ - 2.503387  2.5033875
+07:41:56.291 [run-main-5] DEBUG Main$ - 2.8437304  2.8437302
+07:41:56.291 [run-main-5] DEBUG Main$ - 3.1971984  3.1971986
+07:41:56.291 [run-main-5] DEBUG Main$ - 3.5639772  3.5639775
+07:41:56.291 [run-main-5] DEBUG Main$ - 3.9442587  3.9442585
+07:41:56.291 [run-main-5] DEBUG Main$ - 4.3382263  4.3382254
+07:41:56.291 [run-main-5] DEBUG Main$ - 4.746068  4.7460675
+07:41:56.291 [run-main-5] DEBUG Main$ - 5.1679726  5.167974
+07:41:56.291 [run-main-5] DEBUG Main$ - 5.6041274  5.6041274
+07:41:56.291 [run-main-5] DEBUG Main$ - 6.05472  6.05472
+07:41:56.291 [run-main-5] DEBUG Main$ - 6.5199375  6.5199375
diff --git a/Polynomials.numbers b/Polynomials.numbers
new file mode 100644
index 0000000..c63ceb8
--- /dev/null
+++ b/Polynomials.numbers
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:bae23e57206c21c38e7dec8df1f9453bcd2a89f4226e32f51f54f385cc656455
+size 109912
diff --git a/README.md b/README.md
index fe14034..805666d 100644
--- a/README.md
+++ b/README.md
@@ -127,14 +127,14 @@ From looking at both the AST and the chart you can hopefully see that the third
 
 ### Generating a population of programs
 
-In GP, the leafs of an AST, whether they be constants or variables, are referred to as the terminal set. The branches whether they be unary, binary or some other arity function are referred to as the function set. So, using the AST defined above we can create the following terminal and functional sets:
+In GP, the leafs of an AST, whether they be constants or variables, are referred to as the terminal set. The branches whether they be unary, binary or some other arity function are referred to as the function set. Using the AST defined above the following terminal and functional sets can be created:
 
 ```scala
 val terminalSet = IndexedSeq(Var('x)) ++ 1f.to(5f, 1f).map(Con)
 val functionSet = IndexedSeq(Add, Sub, Div, Mul)
 ```
 
-With these sets it's possible to grow an AST of some arbitrary depth `depth`. The simplest way to do this is to create a `full` tree. The algorithm is reasonably simple. If the depth has been reached then return a random terminal from the terminal set. Otherwise return a random function passing the result of the next recursion as it's argument(s). Here is a method that does that:
+With these sets it's possible to generate an AST of some arbitrary depth `depth`. The simplest way to do this is to create a `full` tree. The algorithm is reasonably simple. If the depth has been reached then return a random terminal from the terminal set. Otherwise return a random function passing the result of the next recursion as it's argument(s). Here is a method that does that:
 
 ```scala
 def full(
@@ -156,7 +156,7 @@ def random[T](elements: IndexedSeq[T]): T = {
 }
 ```
 
-Here are some example ASTs with depths `1`, `2` and `3` generated with by the `full` method:
+Here are some example ASTs with depths `1`, `2` and `3` generated with the `full` method:
 
 ![Full trees](FullTrees.png "Full trees")
 
@@ -185,3 +185,52 @@ def grow(
 def random(): Float = Random.nextFloat()
 ```
 
+Here are three example ASTs all of depth `3` generated with `grow` method:
+
+![Grow trees](GrowTrees.png "Grow trees")
+
+These two methods can be composed together to create the method `rampHalfHalf`. The idea behind this is to use `grow` for one half of the population and `full` for the other. Further, the method starts at `depth` 1 and ramps up to some `maxDepth` (as opposed to all trees being the same `depth`):
+
+```scala
+def rampHalfHalf(
+      count: Int,
+      maxDepth: Int,
+      functions: IndexedSeq[(Exp, Exp) => Exp],
+      terminals: IndexedSeq[Exp]): Set[Exp] = {
+    @tailrec
+    def loop(acc: Set[Exp], i: Int, depth: Int): Set[Exp] = {
+      if(i == count) {
+        acc
+      } else {
+        val tree = if (i % 2 == 0) {
+          full(depth, functions, terminals)
+        } else {
+          grow(depth, functions, terminals)
+        }
+        val nextDepth = if (depth == maxDepth) 1 else depth + 1
+        if (acc.contains(tree)) {
+          loop(acc, i, nextDepth)
+        } else {
+          loop(acc + tree, i + 1, nextDepth)
+        }
+      }
+    }
+    loop(Set.empty, 0, 1)
+  }
+```
+
+The method above is a little finicky for several reasons. First, instead of comparing `acc.size` to `count` the value `i` is used. This is because the `size` method on set is inefficient. Second, if the `acc` set already contains a tree then `i` is not incremented. Third, and contrary to `i`, `depth` is always incremented unless the `maxDepth` has been reached and in this case it is set to `1`. This is because, especially for large values of `count`, it is possible that all permutations of trees at a certain `depth` have been generated. If `depth` were not incremented then the recursion could be infinite.
+
+With the above, it is now possible to create an initial population:
+
+```scala
+val count = 10000
+val maxDepth = 10
+val terminalSet = IndexedSeq(Var('x)) ++ 1f.to(5f, 1f).map(Con)
+val functionSet = IndexedSeq(Add, Sub, Div, Mul)
+val initial = rampHalfHalf(count, maxDepth, functionSet, terminalSet).toVector
+```
+
+# Evaluating fitness
+
+Evaluating fitness is easier than you might think. Given some input there is an expected output. The trick is to select the right inputs. Once that is done, however, evaluating fitness is just a matter of measuring the difference between the expected and actual outputs. For anyone who has done unit testing with multiple test cases this should feel familiar. The only part that might feel alien is measuring the difference and then reducing that measure into one figure for all test cases. For anyone with a machine learning background this will feel quite comfortable.
\ No newline at end of file
diff --git a/SecondDegreePolynomial.pdf b/SecondDegreePolynomial.pdf
new file mode 100644
index 0000000..794b647
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diff --git a/SecondDegreePolynomial.png b/SecondDegreePolynomial.png
new file mode 100644
index 0000000..18cf46a
--- /dev/null
+++ b/SecondDegreePolynomial.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0937b07111c23e4d1b3f52987ea248589cb0fc573f818737c9c4ea9ad7e1696c
+size 45897
diff --git a/ThirdDegreePolynomial.pdf b/ThirdDegreePolynomial.pdf
new file mode 100644
index 0000000..a2ad8a0
Binary files /dev/null and b/ThirdDegreePolynomial.pdf differ
diff --git a/ThirdDegreePolynomial.png b/ThirdDegreePolynomial.png
new file mode 100644
index 0000000..9757e4b
--- /dev/null
+++ b/ThirdDegreePolynomial.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a42462c98a2583a8fad89118e4db0224b235948de7ec31a645ecb2e3af9b1a10
+size 45323
diff --git a/Trees.graffle b/Trees.graffle
new file mode 100644
index 0000000..f6bdbfd
--- /dev/null
+++ b/Trees.graffle
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b39fd344772d528c62e43b67be9fbdad057857183b9c674a5b0aac7ca87319a4
+size 79411
diff --git a/src/main/scala/Main.scala b/src/main/scala/Main.scala
index 4df3c15..dcac0c7 100644
--- a/src/main/scala/Main.scala
+++ b/src/main/scala/Main.scala
@@ -9,17 +9,18 @@ import scala.util.Random
 import model._
 
 object Main extends App with Logging {
-  val population = 10000
+  import GP._
+  val count = 10000
   val maxDepth = 10
   val terminalSet = IndexedSeq(Var('x)) ++ 1f.to(5f, 1f).map(Con)
   val functionSet = IndexedSeq(Add, Sub, Div, Mul)
+  val initial = rampHalfHalf(count, maxDepth, functionSet, terminalSet).toVector
+
   def pow(a: Float, b: Float): Float = Math.pow(a, b).toFloat
   val expected = (-1f).to(1f, 0.05f).map(x => (Map('x -> x), pow(x, 2) - x - 2))
-
 //  val expected = (-3f).to(3f, 0.05f).map(x => (Map('x -> x), pow(x,3) / 4 + 3 * pow(x, 2) / 4 - 3 * x / 2 - 2))
-  val trees = GP.rampHalfHalf(population, maxDepth, functionSet, terminalSet).toVector
   def criteria(fitness: Float): Boolean = fitness < 0.01f
-  val fitTree = GP.run(trees, expected, criteria)
+  val fitTree = run(initial, expected, criteria)
   log.debug(s"Fittest tree: ${fitTree}")
   log.debug("expected\t\tactual")
   expected.foreach { case (symbols, expected) =>